Blower

Abstract

A blower may include an air passage including an air intake hole and an air discharge hole; a fan disposed in the air passage and passing air from the air intake hole to the air discharge hole; a control unit; and a chamber that houses the control unit. The chamber may include a first communication hole communicating outside of the blower to the chamber, and a second communication hole communicating a part of the air passage disposed on an air intake hole side relative to the fan to the chamber. The chamber may include a cooling air passage which allows air having flowed in from the first communication hole to flow out from the second communication hole via the control unit. The first communication hole may be disposed on the air intake hole side relative to the fan with respect to a direction along a rotation axis of the fan.

What is claimed is: 
     
       1. A blower comprising:
 an air passage including an air intake hole through which air flows in and an air discharge hole through which air flows out; 
 a fan disposed in the air passage and configured to pass air from the air intake hole to the air discharge hole; 
 a motor configured to rotate the fan; 
 a control unit configured to control drive of the motor; and 
 a chamber which houses the control unit; 
 wherein 
 the chamber includes a first communication hole and a second communication hole, the first communication hole communicating outside of the blower to the chamber, and the second communication hole communicating a part of the air passage that is disposed on an air intake hole side relative to the fan to the chamber, 
 the chamber includes a cooling air passage which allows air having flowed in from the first communication hole to flow out from the second communication hole via the control unit, 
 the first communication hole is disposed on the air intake hole side relative to the fan with respect to a direction along a rotation axis of the fan, 
 the cooling air passage includes a passage which reaches the second communication hole from the first communication hole via the control unit without turning at an acute angle less than 90 degrees, 
 the blower further comprises a cover member disposed at one end of the air passage and including the air intake hole, 
 the chamber communicates to the air passage without passing through the air intake hole of the cover member, and 
 when the fan rotates, a first air flow and a second air flow are generated, wherein the first air flow flows into the air passage from the outside of the blower through the air intake hole of the cover member, and the second air flow flows into the chamber from the outside of the blower through the first communication hole and then flows into the air passage through the second communication hole without passing through the air intake hole of the cover member. 
 
     
     
       2. The blower according to  claim 1 , further comprising:
 a battery configured to supply electric power to the motor; and 
 a battery terminal to which the battery is detachably attached; 
 wherein 
 at least a part of the battery terminal is disposed in the chamber, and 
 air flowing through the cooling air passage passes the control unit and the at least a part of the battery terminal. 
 
     
     
       3. The blower according to  claim 2 , wherein
 the control unit and the at least a part of the battery terminal are disposed to face each other in the chamber, and 
 air flowing through the cooling air passage passes between the control unit and the at least a part of the battery terminal. 
 
     
     
       4. The blower according to  claim 1 , wherein
 the control unit is inclined with respect to the direction along the rotation axis of the fan. 
 
     
     
       5. The blower according to  claim 1 , wherein the fan is an axial fan. 
     
     
       6. The blower according to  claim 1 , further comprising:
 a handle configured to be gripped by an operator to allow the operator to carry the blower by gripping the handle with a hand of the operator. 
 
     
     
       7. The blower according to  claim 6 , wherein the handle is disposed on the fan side relative to the air intake hole with respect to the direction along the rotation axis of the fan. 
     
     
       8. The blower according to  claim 3 , wherein when the blower is viewed along a left-right direction perpendicular to the direction along the rotation axis of the fan, the first communication hole is disposed between the control unit and the at least a part of the battery terminal. 
     
     
       9. The blower according to  claim 1 , wherein the second communication hole is disposed on the fan side relative to the air intake hole with respect to the direction along the rotation axis of the fan.